Trigger on Vimeo/online video completion.

Hi, 

I am facing an issue on triggers while i am trying have a next button hidden of player and the custom button should appear/change its state post online video completion. But i think i may be making a mistake somewhere please let me know if there is a solution for this.

I am looking forward for the learners to complete the video hosted on vimeo and i am placing it as an embedded video applying below triggers :-

1. Hide Next button when timeline starts.(Works)

2. Hide Prev Button when timeline starts.(Works)

3. Change the state of Next Icon to normal when online video completes.(Not Working)

Please help!

Thanks :)